Pyrocumulus clouds, otherwise known as flammagenitus or “fire clouds,” develop due to “convection initiated by heat from forest fires, wildfires or volcanic eruption activity,” according to the World Meteorological Organization.

The fire in Grand Canyon National Park has grown to more than 100,000 acres amid dry weather and a weak monsoon season in Arizona.

The Dragon Bravo Fire already destroyed the historic Grand Canyon Lodge inside the famed national park and about 100 other buildings.